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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f43fb5cb866c018536d0c7e7d60967b0b5fb6df42fecaa7fb1663e003dee5bd0' 
  AND token = 'r/pee4Vb3cduVLd55Xkc4aLdeHeEJ6AkXTBwbF7V99M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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