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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb980100cfd8412256ea609bba2f2dd55dcfa775e627bc63f1b560ff74d9c097' 
  AND token = 'U5eIGCkqE2NrddOiBhfhhfE36pBbbX/Qx+qad/ZCHXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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