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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee498a464dfbcd855a9de163387906ed3155a251800a18c101c15f8e4332831' 
  AND token = 'z6bi5V5vIc+MckK6cRd7yAY9BAg8C2QeG1sZx62plME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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