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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0396ae4154c511733af48c40aae92631ca3590f7c27eb1a8cc72a29e6146ff' 
  AND token = '5VeNTY88+PBQNVcYWmQj6PwSKTNe1uAsi80NVsYlEzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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