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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf558a541e949cd1c829b8ffab784383bbfccc1b03b0e0d544ea4f769a47630c' 
  AND token = 's/8xP9zdlZB+Dw4VI3YxGy4ag1gLjkYRW0Jre3tWYWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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