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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6828b194d051313a5577863284ab60869717ff483a39120f5039cecf55b51e' 
  AND token = 'AnG3+Bt2W97SsHX1JcRuHi4cm/Vf60JvYk9uiGAYaRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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