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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '047f64288df9bd51d5182fb06439d2d71979964d3600e5ed600e8c6e8f14e134' 
  AND token = 'XuxoqpO0i9GoJepE7Nx5+MjGAfozrr2KD9wuZnr+s6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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