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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dff4092c3672b772ec8016c6d9f33b28b4fa83cdb1ae2474d65f68a3cdf016c' 
  AND token = 'bCuBeJjxk7saUEWWBg6DhnZ20KTkDbRU28/L2mv6HV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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