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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902eae6e002b86f835a1f20967f5739db98f9bac428464ad5add4319137fa3b7' 
  AND token = 'HKzq/etHn8jGxUP/6kTK2eZevvZPIMdH10bpJK4SSEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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