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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c1b42124d808425b31ecca583b0a1a5926df74593f4458de6bebce4c440ca8' 
  AND token = 'i5+mzZWfgu/DbMXeCG4Hut/QR8PW41yoF42CpiXsfWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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