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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087f3a8b16dfe3f6b1f9adf715a80e35e3bb4df0165ab17f56ec17c2af0d989f' 
  AND token = 'LDfSgklEf9FC2AIKyOTQVHa6C/GSGNLoyMFPsQms14g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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