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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a58a785f19d53cbd57906ac88ed0d22162bd59f19f21c401f64c7d6c1298069' 
  AND token = 'AqmHm3fCp1uxp1UChx0eIWb1q789GxxrYcPkYTpg2gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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