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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d504b56dc700247eec0531ecb42a8de806feb23e09d182a16e499863afa8d2' 
  AND token = 'Pg3tCpxk829mkZcaXl/8DM0p7bWIpa+O335qjFdrzt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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