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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb4ac10b00f857839c6e2b2de255f78919d9cd2da859d459ad2fd23646da99c' 
  AND token = 'L80SYHps/ZVwm3ns9YZbtISq6igMwBS74MwkBXpI2Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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