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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e14fa15dc495559e02f6ee932b5df224517e672dfe41f61415a606efa96a057' 
  AND token = 'CqaQXzinDvTBbr6ess2qIW/DayTV3SxO/17GgvWQefY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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