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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07d17afb9425f17332d405af3f3b19dc42009d6c8ee5997b0e3e403caaf0cb7' 
  AND token = 'lntxwUGrEaxQAnGnkZIeZxTVZQuJKut3MO0GYkyCjvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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