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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec3bb5184e4161080994f26b55121e46e0df61195776b47daa01e076ca7c542' 
  AND token = 'xFm+v64KI6m57bj5RIhmCeLO0f2PYRMc9rqGI+5VErk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00269

JSON explain

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