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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b8108f3d0cf0f0c10f4e25bff4c66a0f95b770e58d4f68e20863d54a35fa34' 
  AND token = 'YAdJZgs3235goR7IIxDEKK5Q/A6iu6d/N9b5EtnDhJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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