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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e5ba8cf695c56674a497adc5907685e4aa0736e3a09f5e6d8b5db69ea5168b' 
  AND token = 'qeDGpspaA8HJK9WDZ1hGcnO+5G0U7HMMA/5FgDh1ZfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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