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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809d76769da8a2dfa45d7aff490e6327e3451dec70696b0c37ae41a5c4458488' 
  AND token = 'Y/oqmzoBjpaqHkW6uLStRwOV7Lnlh6djHsdEM2e9O38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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