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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3e84facc546bd8ed86414353ed267f2751c7105cd169f0fb55847c38d15377' 
  AND token = 'O4MP1CJ7j1IrwDZY9RYJbW/0eHrja3aACOvzYlXbbUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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