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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd14de90482446d67256ed1d0e1a9240dc0ec59e674aaeb014603ffd08cb2c47f' 
  AND token = '82lQCk2qLUP6pnc1p2f+tDuEUhgbwGo6XKhRcZ0LQ0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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