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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed200aab948c90c6b8b58d64968b8b6ecec90dcb2bc38a6a982111f26cd6ecf4' 
  AND token = '6uuTfnSqT78pn3atsY+sJwl9TtjB1N0rop4T6at2C/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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