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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c7c8dcbe2c09e54cbff7e3567ecc3a7eaabf7a0f082ba454447d40de96b865' 
  AND token = '2teoKlVrJtniX6YzPR68nF/+T3CW4l11DWnBWymvIJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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