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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37dd8b1a602c7a9028e99fa6fcf8d14b4c5e9f041dcb9fb771b0c0ffee798486' 
  AND token = 'SyYfgISkOf7bl+TA0ztk1KHAYBnrJWMFC+cJl+eyhfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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