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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '094fe15672f9f3a0c0e453829c65cbb6adba10099d50ca650b4ce7b14c8db9a5' 
  AND token = 'nMGrWV1AZz7zvhJuTV9C0URTbaW3aLZhGowMED+C6T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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