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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29bd9f62867fa6a497df7525d8dbfcf7e89b0940a0e977eb77d84e290b24e27a' 
  AND token = 'vb7Y68512XpjHWKEcbqMQw2ZEgqxcnQvF6lKQlo34p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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