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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6603cb0637580a56e15480fdb243cb29480d9dde30090c7517e0863035ef540' 
  AND token = 'X0Vo1WVF/McwuAmN4eZ7zzW7q5YVnQF8rWAHevkV8s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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