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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb5963d73269c1b32036dff9a36dffd0033c661641e405754d21af0ca6d8e8f' 
  AND token = 'JrgSxnsb9Qlh7/1AFOEd8mcP0sabgdpu/0USuW1vF6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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