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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '217fab8a8298fdb6d761c35c0188d719b81ef04d3c1349d783e7f05a858d78d3' 
  AND token = 'ZN/V8a2ohtZG0Os0YgM0T+Ifp4x22gA2C/aue3KBB+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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