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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca084941e614757747478b7fc7888ce92e97305d7a321fba0526b8e4c979d70' 
  AND token = 'PHA6pN7mtbZMtj5b5NPiHdVOEuvRpwtMw+p+o7mAyxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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