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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41dc714bfb7e846d57cfb2406b90bf58bd339497e64f448998a5628046c40675' 
  AND token = 'xhRNeohelGqRi2Rfj45kuZ4HtEbitJcedoVH2m9yZKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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