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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0e24bada56ee16ddc95315c5b6fe5adb4fb1c1fd51e3d1110f6e4e75c5ec61' 
  AND token = 'zovnkN26seU1Juf2vwMAn04O64iGLuCqeanCnfgKQmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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