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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b2c644aa40726ec44e6a1b4c53273c08ba3bf620021f39870dfc881421d31a' 
  AND token = 'hm62FbSfLzcz9Lwhf7q+LzqANGFKoGHUnF/02z+0F+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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