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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c173624a72d7229e0e329304c002af71ff42e01c654e40b5a64c0b2226179b' 
  AND token = 'y81oxt/4hFDhqsw3y5KeqcGnxBJHevDCq8Iv4z7Uukc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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