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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c9c380556a5e0a52cd4018fbae1981c1b4818b3049f2b670bb0da5e778eb35' 
  AND token = 'L9yyqvaAmhiOZzPKjz1ItRQr4k71dYSpkaZGGIVYJAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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