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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddcf044b9ae5af4a37ad13eb7f3021c10084ddbf0e2c3f20f8a928a74ae17839' 
  AND token = 'GxDyEUcqXoF/6hf+E2I7stcDmUBrysJjeh+QTupfd8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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