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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '493aacc58e3e6300f42054acf0303c194947295a5dbef206986b6b7da9976507' 
  AND token = 'L/2hqkxF+i7vocMosLYQhta1NOH6vw4AZOuh+YR2hFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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