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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '933253bb6e2e68e54089bf40c352b9d92682f927036f5099ac6fc8965dd183e1' 
  AND token = '2r6y1sGxx3hRa0Ud0wTgnTtTEfw0ZbtDuCo7NGQoBUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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