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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '992a13dcae14c9c8f681582bc8b9d1ab35f40ca671309f3ad85d9ac01faebfd3' 
  AND token = 'YhWpX9z616SV93hdiDqorh/3vmsrM/mCxGXhgQycsP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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