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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3038ea8fb4d40e400955b7f7ec582172960036a6a7a4f109a8f4b1adbb25c3ca' 
  AND token = '6t6CizETmUYi+I+Uc0Rf0PYxaR03+oDYnXMuZaNImxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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