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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5af8d9804f3b0746ea49a5b95bd4fdbf7aa0f01a2011829409dce9101b0922' 
  AND token = 'UxbCf2TTj2BzLcpIr2KfDbRUG/naiKnDx9+t2QxFjqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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