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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d09b0bf79794ab0f650b4398e2f4150586db568dfcfefa5e2930c8ddc0c055' 
  AND token = '6jUPMQcEMQoju6QHOwrF9jfckhR3g3fqR/9n+Z8P3pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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