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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9feb0ff023bea6a586380ad4c180a4946aad69f6561dbdc3dda6a83700c9b89' 
  AND token = 'X10bFhUEEgjYIiVM+jlc1P++mSvOdH/VFOf59sMcfHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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