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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc9ab1d667100bda4fbbf5ec7eec902be965c64c09d61b8b2e48d6086dd02de' 
  AND token = 'z8Wm9aowGwjkBLFKgG/67oP85BsLH0Zl72IhLsCVWoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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