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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b9cdf499ad0bb494e46bf3bd8c71b686e524928ee91b17c677f0a16d587a9a' 
  AND token = 's9saKLEmgKc6QRYmha/Iv5tO56S4CN2FLt8ZGSzTgCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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