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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6115ca96a4e46231a8aaf6a15af764c4586a572b0db38e116e2e6027d6766a94' 
  AND token = '/36iPNKyG7gnY6lA4JTXdb6GOm3WcjKJvB5QqoTjDrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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