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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '865c5d572cad319150613bc9482a443199b96784f51e542c838ad65ceb7991ea' 
  AND token = 'TRarEO1Iz7b3x0wtz2iOASRJ4Le8RHDMbbfAjD+xU2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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