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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c110f329c26b7caf1a035f273c7fa88031aae91cea62437cba1eddb300718ed' 
  AND token = 'HB7ArF0BaOeftt7tS4tiU62SlBM8L6mjTqZen8Lcl84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}