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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ffb2ab73c299a20936abc6cdb900578762432b161095c3a59f9815e2f7b6289' 
  AND token = 'Q1sixkJTqLJh+1LSH/LBCobbBePKOggU1hF0qCs471E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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