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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd41ae81b47b3bdce083b2e2b3400d6103ec42fdffee2ca3c06fc2502abf2ba11' 
  AND token = 'Ro9OvtV2Oq5Xi9sgCnxOw8MtdPdykl7W2CEFFukE/oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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