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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cbb0251214b789bfabe65b65cc5ef1210b94f791c14d734a1637aad5b8dbb13' 
  AND token = 'd0oNZC7/+4HkDAsxz9MHJGCXACKHn2RLUJHCsCDvPWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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