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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e35ffe08189f74e60ac910ec3f7f255e070b44969a3bb5783702732100787022' 
  AND token = 'zEI+T8nUQRtGE4R+pRr3dYleJSV8KhPS2fRnatfHKmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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