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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa38109e49d9e73f92edb930998fcefbb89027ab6fb51930d4344eea0a0a40b' 
  AND token = '81DzNZmQ8amEsRW9X956b2mXoojHEAf9gJxMHlnUo38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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