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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8072fc72492f235e4da1ce483d02f32a983fb6879c4212d3498d0eb41ae3be9' 
  AND token = '2RuvB6559obJljAsdPVbRPzrjorCiWJEG9D1uYlf2Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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