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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d76a501d1018c2ef6328f14db6288fd96fb15216a173dcaf2598e2b692802d7' 
  AND token = 'VcnWUR7CUdcnj/X5aMEQteQIhtHOmndVjsshs14nj7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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