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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c49cf41b965ffc14c388ca27b938300469fe46efbae558f05b91b0b2d8526293' 
  AND token = 'ESeQtpiT9IcsgTOyx6vYoy2ej8Qvd1B0wx8sBSFUiwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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