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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13283a0117d0c6af27629c273f4064aaed7a4bc3892cb28ace13ed999757a4c1' 
  AND token = 'v4016TQAlJ13d1U2ALWzctrePkIGi6ISIeOJTvZjfp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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